Home / 1,279.36-1,921.20-1,269.28

Finding the Fourth Proportional to 1,279.36, 1,921.20 and 1,269.28

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Solution

The fourth proportional to 1,279.36, 1,921.20 and 1,269.28 is: 1,906.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.36 : 1,921.20 = 1,269.28 : x
  2. Step 2: Convert to fraction form
    1,279.36/1,921.20 = 1,269.28/x
  3. Step 3: Cross multiply
    1,279.36x = 1,921.20 × 1,269.28
  4. Step 4: Simplify right side
    1,279.36x = 2,438,540.74
  5. Step 5: Solve for x
    x = 2,438,540.74/1,279.36
  6. Step 6: Final answer
    x = 1,906.06

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.